<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
</head>
<body>
<ul id="test">
    <li class="js1">你好呀</li>
    <li name="js2">你不好</li>
</ul>
<script>
    $()
</script>
</body>
</html>